[ERA Chas]

You don't mention floats-check for porous one and level of both. Lower is better than higher. Look for a needled seat that may be grooved by dirt.
With 2.250 intake valves and moderately big cam I used 65 jets and 37 squirters (up from 31).
Check the vacuum diaphrams in the secondaries for tears or leaks, they may have caused the spring rate to change causing a bog off idle.
If all checks are OK, try the next hole on the pump cam on the second carb to bring the pump in a bit quicker. If bog gets worse, go back.
Do one check at a time, testing between so you don't lose where you started from.